This isn't a particularly original or great work, but it's another work nonetheless, based on that one "realistic starfield" Photoshop tutorial that's out there somewhere. I almost don't want to post this just because it's so generic. Noise filter, several adjustments to color, brightness, etc., duplicated layer with a blur and more color adjustment, repeat 3 times and blend. Oh, I forgot all the clone burshing. Basically, the same thing I always do.